Micrometer adjustment



F. R. SOMMER.

gmcRoMETE ADJUSTMENT. APPLICATIONA FILED JUNE l5, 1920.

1,435,025u Patented Nov. 7, 1922.

i i Wwf@ J l I Patented Nov. '27, i922.

r earn MICROEETER ADJUSTIJIENT.

Application filed .Tune 15,

T 0 all whom 'it muy cof/cem Be it known that l, FRED kR. SOMMER, citizen of the United States, residing` at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful improvements in Micrometer Adjustments, of which the following is a specification. V

This invention relates to an improved micrometer adjustment for microscopes, telescopes and other scientific instruments. Heretofore the relative adjustment between two telescopic sections or parts of many scientific devices has been maintained by relying on the frictional engagement between the parts but this is objectionable because it is almost'iinpossible to shift to a minute 'Y degree. Also, an alternative method utilizing a rack and pinion for adjustment is likewise objectionable because of the comparatively great expense of cutting the toothed parts while at the same time these elements offer an obstruction on the exposed portions of the instruments whichare in the way and Otherwise a source of annoyance. i a j n i Accordingly, a primary Object of the invention is to provide a simple and convenient means which may be Vreadily manipulated to move the relatively shiftable parts of scientiiic instruments with a maximum degree of accuracy which is essential to obtaining reliable conclusions in scientific investigations.rv ln this connection it is proposed to provide a constructionofa simple mechanical nature that can be made without the use of special toolsor expensive equip-` ment, thus enabling the cost of this feature of instruments of a character requiring such adjustments to belmaterially reduced, while at the same time generally simplifying assembly and the mode of operation.

It will therefore be apparent that the present invention aims to provide a simple and compact arrangement whereby the desired adjustment may be easily effected with a maximum degree of efficiency.

Other objects will appear as the description proceeds.

A preferred and practical embodiment of 1920; Serial No. 389,108.

the invention is shown in the accompanying drawings in which:

Figure vl is a view partlv in section and partly in elevation illustrating the present improvements.`

Figure 2 is a cross section on the line 2-2 of Figure l. 1

Similar reference characters designate corresponding parts throughout the several figures of the drawings.

The present invention is susceptible of a wide range of application to instruments requiring minute. and accurate adjustments, such for instance, as microscopes, telescopes.` levels and other instrumentsand by way of illustrating one application thereof reference may be made to the drawings wherein the improvements are shown in connection with microscope for the purpose of varying the distance between the eye-piece and the objective end. ln the embodiment shown, the main tube or vcasing l may be frictionally held within the bore 2 of a supporting arm 3 by a suitable clamping bolt inserted in the opening -i of the yieldingjaws `5. Obviously by tightening and loosening the clamping bolt the jaws of the clamp may be'manipulated to permit the main tube to be Vquickly adjusted to any desired position, and thereafter further adjustments may be made with great accuracy through the utilization of the present im* proveznents. j

- Referring ymore particularly to the novel features of the present improvement it will be observed that the main casing l is eX- ternally threaded as at 6, the said threads being either of the single or multiple thread type, while its side wall has therein a slot 7 which may be of the straight formation shown or spiral formation to constitute a guide or run-way for the nut 8 or its equivalent which is preferably held as at 9 to the body of the interior tubular member l0 that telescopically slides within the casing l.

The said interior member l0 is preferably provided with a suitable collar l1 adapted to be engaged by a novel shifting nut 12 in such a manner that the said member may be accurately moved with reference to the casing 1. And, the shiftingI nut 12 is enteriorly milled es at 13 to atlord a convenient linger grip, While its interior is threaded es 1e to engage With the threads 6 of the main casing; 1. Also, the said nut l2 is providedfwith an annuler interior abutment shoulder 'L or engagingi with one side oit the coller ot'the nut has litted thereto a relatively separable locking; ring 1G 'for ene'aging with the side oit said collar l1 oppositethe abutment shoulder 15. The ring' 1G therefore cooperates with the annular abutment shoulder 1.5 to lock the interior tubular member with the nut in such a manner that when the nut is rota-ted on the threads 6 olf the main eesing the inter-for tubular member will be shifted longitudinally with relier ence to the main casing'. i

The lor-king' ring 1G previously referred to is n'eterably proviffled with a scale on its exposed si nre iter Y with suitable markers lll on the interior casing' member so that the degree et movement oithe nut may be readily determined to properly shilt the interior member with reference to the outer tubular member or main c-ising` 1. 'As a part oi' the means iforadjusting the relative position olf the two members the `guide nut 8 which carried with the interior tubular member is provided with a zero marker to be read" in connection 'with asca-le S Ytormed alone the edge of the slot 'i'. By means of the scales S and S the relative nmvement between the two members may be accurately determined, according to the unit ot measurement represented by the divisions et the resliective scales.

From the foregoing` it will be apparent tlurt the present improvement essentially contemplates e relatively li 3d easing' 1 and a. relatively shittable interior member which may be shitted with reil'erence to the said casingby means oit u rotatable adjusting device in the form of the nut 1Q which is locked with the interior tubular member and has u threaded engagement with the outer mein casing-member 1 simply' manipulating the nut 1Q in a clock-wise `or counter clockwise direction the inter-:iwf tubular member 10 may b elv the distance @te heir lin ein the desired` results,

lVithout further descrintion it is thought that the features end entages of the `invention will be 'reedilvapparent to those skilled in the art, and it will et course be understood th at che'nes in the form, propon l While the upper end tion and minor details olf construction may be resorted to Without departing from the spirit of the invention or scope of the eppended claims.

l claim:

l. An adjustment device olf1 the class described including' a pair ot `relatively telesropicelly assembled members, an abutment on one of said members and feedingv threads on the other member, and a sleeve having collars engaging both sides of seid abutment and also engaging with said feeding threads.

9,. An adjustment device ci' the class described including' a pair of relatively telesropically assembled tubulsrinembers, en annuler abutment on one oi said members und 'feeding threads on the other, and sleeve having threads `tor engaging' With the feedin,0l threads of' one member and means for With both sides ot said annular abu ment. i

i3. Au adjustment device ot the class described including a relatively lined tubulin' i member having;` a slot end feeding threads :it one end thereof7 a relatively shifteble tubular member telescoping' Within the iiied member, a `guide projection carried by the shiltnble member ttor riding in seid slot, an f xnnulm' abutment also fin-said shitteble member, a sleeve having interior threads tor vith tbeseid feeding; threads and an interior annular abutment eirgwejV-ngi shoulder, and 2L fastening' ring' detarhabljv secured'to said sleeve at one side ot the said shoulder to provide a channel tor rotatnbly receiving; the annular abutment on th sbittable member. f

An adjustment device ot theV class described includinga` relatively fixed tubular member having a Lguide slot and feed threads, :t shijltable member teles'copintf.; ,rithinthe saidtubular men'iber and having a ruido i'ojection1 a scale arranged elongv the edge ot' the guide slot and cooperating` with a Zero marker on the guide nut, ay sleeve interlorjlfed with seid shiftable member. and having a feeding` engagement With said threads on the tubular memberg and a, scale infer :er onthe sleeve and adapted to rend .inconneotion with the scale. nfiarlrers on the circumference ot they sbtteble' member.

In 'testimony ivhereolzl hereunto atti): my signature in the' presence ot two witnesses FRED SQMMER.

lllitnesses EMOR f' L. SRorF. A. J. COOPER. 

